WO1999060210A1 - Appareil applicateur et procede de revetement par transfert de film - Google Patents

Appareil applicateur et procede de revetement par transfert de film Download PDF

Info

Publication number
WO1999060210A1
WO1999060210A1 PCT/FI1999/000436 FI9900436W WO9960210A1 WO 1999060210 A1 WO1999060210 A1 WO 1999060210A1 FI 9900436 W FI9900436 W FI 9900436W WO 9960210 A1 WO9960210 A1 WO 9960210A1
Authority
WO
WIPO (PCT)
Prior art keywords
roll
applicator
dam member
treatment material
web
Prior art date
Application number
PCT/FI1999/000436
Other languages
English (en)
Inventor
Rauno Rantanen
Original Assignee
Valmet Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valmet Corporation filed Critical Valmet Corporation
Priority to CA002332249A priority Critical patent/CA2332249A1/fr
Priority to AU42682/99A priority patent/AU4268299A/en
Priority to EP99952104A priority patent/EP1082495A1/fr
Publication of WO1999060210A1 publication Critical patent/WO1999060210A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0817—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line characterised by means for removing partially liquid or other fluent material from the roller, e.g. scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
    • B05C11/025—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with an essentially cylindrical body, e.g. roll or rod

Definitions

  • the present invention relates to an applicator apparatus according to the preamble of claim 1 for use in a film- transfer coater employed in coating paper or board, in particular concerning a lubrication arrangement of the doctoring member adapted to the front edge of the press- urized applicator chamber of said applicator apparatus.
  • the invention also concerns a method for coating paper or board, said method being capable of reducing the friction occurring between the film of coating material remaining after the applicator roll press nip and the member sealing the front edge of said applicator chamber.
  • the chamber front-edge sealing member can be a doctor blade or rod. The lubricant cleans the blade or rod free from foreign matter and size material residues that are then allowed to drip into a collection trough adapted below said chamber front -edge sealing member.
  • the invention relates generally to methods and apparatuses used for metering coating material on a moving base web of paper or board in a manner comprising first spreading the coating or size on the applicator roll of a size press. Next, the coat film formed on the applicator roll surface is transferred further to the moving web in a nip between the applicator roll and a backing roll.
  • Conventional coating equipment such as short -dwell applicator apparatuses employed for coating a moving web of paper are understood to include all the arrangements required for feeding the coating material under a posi- tive pressure into the applicator chamber which at its one end is bordered by a doctoring member such as a doctor blade and at its other end by the applicator chamber front edge, whereby the application zone is formed between the web being coated and the applicator chamber front edge.
  • a doctoring member such as a doctor blade and at its other end by the applicator chamber front edge
  • an overflow or reverse flow is created thus forming a flow directed reverse to the travelling direction of the web.
  • a flow running opposite to the web movement is passed via the gap between the applicator chamber front edge and the applicator roll or the web, whereby a liquid seal is provided capable of preventing the passage of air into the applicator chamber.
  • FI patent no. 61,534 discloses a coater in which the coating is applied to the web being coated under a positive pressure with a controlled volumetric rate.
  • the overflow portion could be smaller than what is needed for sealing off the gap with the coating material, it still is relatively large as compared to the amount adhering to the roll surface as a coating material film.
  • the gap is made wide, the positive pressure of the applicator chamber cannot be easily increased due to the small flow resistance formed by the wide gap to the passage of the coating material therethrough. Hence, any increase of the positive pressure in the applicator chamber also causes a corresponding increase of overflow or, respectively, reverse-direction flow through the gap.
  • the gap is decreased to, e.g.,
  • US Pat. No. 4,839,201 describes an apparatus in which the applicator chamber is sealed off by means of two blades or, alternatively, two rods.
  • the coating material is first applied by the apparatus onto an applicator roll and therefrom further to the web being coated.
  • no actual reverse-direction flow takes place via the gap between the applicator chamber blade or rod and the opposed applicator roll, but instead, a homogeneous layer of water, size that is used or other liquid lubricant is passed in front of said blade or rod, e.g., via holes made to the dam blade.
  • a lubricant pond is formed in front of the ingoing-side edge member that prevents the friction otherwise occurring between a dry edge member and the applicator roll from causing damage to the roll or the edge member.
  • this apparatus construction requires no actual reverse-direction flow to be provided, the zone in front of said blade or rod must anyhow be cleared free from the used lubricant and the coating material or size scraped away from the surface of the applicator roll by said edge member.
  • the lubricant in this system is advantageously utilized the same material as is being applied to the web, because then any amount of the lubricant possibly passing into the appli- cator chamber will not dilute the material contained therein.
  • the coating material or size used as the lubricant could be replaced by water
  • its access into the applicator chamber could dilute the material contained therein and, moreover, it can form a film on the appli- cator roll that prevents the coating material or size from adhering evenly to the roll surface.
  • lubrication with water may cause coating defects.
  • the handling of water or other liquid lubricant is clumsy due to splashing and, further, since the used lubricant must be collected away from the point of lubrication and returned to the coating material or size circulation, or when using water as the lubricant, to the waste water treatment system.
  • the above- described apparatus cannot serve in a coater of the nonreturn type, because the lubricant applied to the blade or rod acting as the front edge member of the applicator apparatus always needs a return circulation for the lubricant. Even if the amount of applied lubricant could be minimized, the implementation of the return circulation causes extra costs and the coating material returned back from the circulation to the applicator is always of a lower quality as compared to the fresh coating material or size.
  • the goal of the invention is achieved by lubricating the front edge member of the applicator chamber using injection of steam into the gap between said member and the applicator roll.
  • the applicator apparatus according to the invention for use in a film-transfer coater is characterized by what is stated in the characterizing part of claim 1.
  • the invention offers significant benefits in the art of coating techniques inasmuch the lubrication of the front edge member of an applicator apparatus by means of steam injected from a steam injector facilitates the manufacture of a final product with improved smoothness of its surface profile. Furthermore, the occurrence of blade streaking in the coated final product is reduced by virtue of the condensing steam that cleans the front edge member of the applicator chamber free from any foreign matter such as fiber and foreign matter adhering to the applicator roll surface.
  • the coating mix circulation can be designed as a nonreturn system, which means that all the coating mix fed into the applicator chamber will be transferred onto the applicator roll.
  • the applicator apparatus can be run without any coating mix return circulation and the applicator chamber is continually filled with fresh coating mix.
  • the quality of the coating mix stays good because no air or foreign matter can become entrained with the mix and the equipment will remain cleaner.
  • the amounts of coating mix to be handled are smaller inasmuch no excess coating mix or size is needed in the application step.
  • Surface sizing of paper or board can be accomplished by a system of absolutely no return circulation, since the surface size needs no doctoring after application. Obviously, the excess coating material removed by means of doctoring or other smoothing technique from the web surface must be treated in a suitable manner.
  • Figure 1 is a cross-sectional side view of an embodiment of the invention.
  • Figure 2 is a cross-sectional side view of another embodiment of the invention.
  • the present invention relates to a coating method and apparatus disclosed in US Pat. No. 4,839,201 to which reference is also made herein.
  • This type of apparatus is suited for applying surface size or different kinds of coating materials to a moving web and here such agents and compositions to be applied to a web are generally named as treating agents.
  • the apparatus 10 comprises an applicator chamber 2 covering area B on an applicator roll 1.
  • the area B is bordered by a doctor blade 4 and a dam blade 3.
  • the doctor blade 4 is an acute-angle blade which is loaded by means of a pneumatic tube 5.
  • the position and angle of the blade support beam 8 in regard to the applicator roll 1 can be adjusted in a conventional manner to control the operation of the apparatus. A detailed description of these adjustment arrangements are omitted herein.
  • the volume of the applicator chamber 2 is very small, which means that the turbulence caused by the surface of the roll 1 rotating therein is minimal.
  • the coating mix is fed under a positive pressure and with a desired volumetric rate into the applicator chamber 2.
  • the infeed rate of mix can be kept equal to the amount of mix being transferred to the surface of the roll 1, because there is no need for a lubricating reverse-direction flow.
  • the applicator chamber 2 is directly sealed against the roll 1 by means of the dam blade 3 which is loaded against the surface of the applicator roll with the help of the blade holder assembly 18. In this case, there is no lubricating flow outward from the applicator chamber 2 onto the dam blade 3 , and running the dam blade
  • lubrication is accomplished by virtue of injecting steam by means of a steam injector 7 into the gap between the dam blade 3 and the applicator roll 1.
  • a steam injector of a tubular shape is used having an elongated nozzle slot provided to its side.
  • the amount of condensate water is minimal thus having no detrimental effect on the film being applied to the surface of the applicator roll 1 in the applicator apparatus 10, thus making lubrication with steam capable of overcoming the problems hampering lubrication with water.
  • the water condensing from the steam and the injected hot steam itself clean the dam blade 3 free from adhering foreign matter and accumulating size or coating mix residues.
  • the condensate water and removed foreign matter can be collected into a collection trough adapted to the stem of the dam blade. Condensation of steam can be promoted by cooled structures, e.g., providing the blade holder with a cooling water circulation.
  • the coating mix leveling member is a doctor blade and the applicator chamber front edge is formed by a similar member called a dam blade. It must be noted that depending on the actual design the chamber front edge can be angled in a desired manner, whereby the dam blade angle with the roll may be varied, e.g., in the range 0-180°.
  • Fig. 2 an assembly in which the doctoring member is a rotating rod 12 mounted on a rod cradle 11.
  • the rod 12 and the cradle 11 are supported to the applicator apparatus frame 13 by means of a pressurized tube
  • the doctor rod 12 may be a smooth or grooved rod.
  • the front edge of the applicator chamber 2 is bordered by means of a rod 15 adapted in a rod cradle 16 and supported to the applicator apparatus frame by means of a pressurized tube 17.
  • the diameter of the front edge rod 15 is made slightly smaller than that of the doctor rod 12 and, advantageously, the front edge is provided with a smooth rod, because the lubricating effect of steam is better on a smooth- surfaced rod than when using a grooved doctor rod.
  • a grooved rod tends to pass size or coating furnish via the grooves to the zone in front of the rod.
  • the front edge rod called the dam rod 15 is lubricated by steam injected from a nozzle 7 that both cleans the rod and lubricates the gap between the applicator roll 1 and the dam roll 15.
  • the linear loading of the dam rod 15 against the surface of the applicator roll 1 is set to a desired value by means of a pressurized tube 17.
  • the dam rod 15 must be loaded against the applicator roll 1 so strongly that size, coating mix or other web treatment agent cannot pass from the applicator chamber 2 reverse to the direction of rotation of the applicator roll.
  • the system operates without any reverse flow sealing the gap between the dam rod 15 and the applicator roll, it is extremely essential that the rod is loaded tightly against the applicator roll 1 in order to prevent entry of air into the applicator chamber. Owing to the otherwise sealed structure of the applicator chamber 2, the treating agent pumped therein can leave the chamber but by being transferred to the applicator roll via the doctor rod 12, whereby no reverse flow occurs.
  • the apparatus operates without any return circulation.
  • the dam rod 15 can be cooled by lubrication water circulated in the rod cradle or by arranging a cooling water circulation into the interior of the rod or in the rod cradle.
  • the steam injection can be sealed from the machine hall enviroment with the help of, e.g., sufficiently tight hoods.
  • the need for enclosures depends on the amount of steam used, whereby minor amounts of steam may be released into the machine space.
  • the invention may have alternative embodiments.
  • the lubricating steam can be fed to the chamber front edge dam member using the above-mentioned slotted nozzle or with the help of a set of separate nozzles mounted on said injection tube, using nozzles having a separate steam feed for each, or any other suitable manner.
  • a doctor blade and a rod-like dam member, or alternatively, a dam blade and a doctor rod may be combined in the same apparatus.
  • Multiple different manners are known in the art for implementing the blade and rod holders and their loading assemblies.

Landscapes

  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

La présente invention concerne un appareil applicateur (10) destiné à une coucheuse à transfert de film. L'appareil applicateur (10) comporte une chambre d'application (2) bordée par une zone (B) de la surface dudit rouleau applicateur rotatif (1) et par un appareil applicateur (10) comportant un docteur (4, 12) conçu pour s'étendre dans le sens de l'axe longitudinal du rouleau, essentiellement sur la largeur du rouleau (1). La chambre est également bordée par un élément réglette (3, 15) situé devant le docteur (4, 12) par rapport au sens de rotation dudit rouleau (1), de façon à s'étendre dans le sens de l'axe longitudinal du rouleau, essentiellement sur la largeur du rouleau (1). L'appareil applicateur comporte, en outre, un moyen (6) permettant d'amener la matière de traitement de bande continue dans la chambre d'application (2), et un moyen (7) permet d'amener de la vapeur dans l'écartement entre le rouleau applicateur (1) et l'élément réglette (3, 15) de façon à lubrifier cet élément réglette (3, 15).
PCT/FI1999/000436 1998-05-20 1999-05-20 Appareil applicateur et procede de revetement par transfert de film WO1999060210A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA002332249A CA2332249A1 (fr) 1998-05-20 1999-05-20 Appareil applicateur et procede de revetement par transfert de film
AU42682/99A AU4268299A (en) 1998-05-20 1999-05-20 Applicator apparatus and method for film-transfer coating
EP99952104A EP1082495A1 (fr) 1998-05-20 1999-05-20 Appareil applicateur et procede de revetement par transfert de film

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI981135 1998-05-20
FI981135A FI111230B (fi) 1998-05-20 1998-05-20 Filminsiirtopäällystimen applikointilaite ja menetelmä applikointikammion tulopuolen rajaavan elimen voitelemiseksi

Publications (1)

Publication Number Publication Date
WO1999060210A1 true WO1999060210A1 (fr) 1999-11-25

Family

ID=8551779

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1999/000436 WO1999060210A1 (fr) 1998-05-20 1999-05-20 Appareil applicateur et procede de revetement par transfert de film

Country Status (5)

Country Link
EP (1) EP1082495A1 (fr)
AU (1) AU4268299A (fr)
CA (1) CA2332249A1 (fr)
FI (1) FI111230B (fr)
WO (1) WO1999060210A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1234912A2 (fr) * 2001-02-13 2002-08-28 Mitsubishi Heavy Industries, Ltd. Appareil de couchage et procédé de fabrication de papier couché
DE10144600A1 (de) * 2001-09-11 2003-03-27 Voith Paper Patent Gmbh Auftragsvorrichtung
WO2004070113A1 (fr) * 2003-02-10 2004-08-19 Metso Paper, Inc. Dispositif d'application de machine a revetement par transfert de film et procede de revetement correspondant
WO2008151943A1 (fr) * 2007-06-13 2008-12-18 Voith Patent Gmbh Dispositif racleur
CN108049244A (zh) * 2017-12-08 2018-05-18 安徽金亿禾特种纸有限公司 一种涂布均匀的方法
US11241708B2 (en) 2019-04-12 2022-02-08 Airbus Operations Gmbh Device for lacquer transfer
US11267014B2 (en) 2019-03-29 2022-03-08 Airbus Operations Gmbh Device for lacquer transfer
US11331688B2 (en) 2019-03-29 2022-05-17 Airbus Operations Gmbh Device for lacquer transfer
US11369987B2 (en) 2019-03-29 2022-06-28 Airbus Operations Gmbh Device and system
US11413650B2 (en) 2019-04-11 2022-08-16 Airbus Operations Gmbh Lacquer transfer device
US11504739B2 (en) 2019-03-29 2022-11-22 Airbus Operations Gmbh Device for lacquer transfer

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4839201A (en) * 1987-12-03 1989-06-13 Valmet Paper Machinery Inc. Method and apparatus for applying coating liquid to a moving base
US5376177A (en) * 1993-08-09 1994-12-27 Macmillan Bloedel Limited Coat weight profiling
US5567479A (en) * 1992-12-15 1996-10-22 Valmet Corporation Method and device for coating the face of a roll in a film size press
EP0761878A2 (fr) * 1995-09-01 1997-03-12 Voith Sulzer Papiermaschinen Gesellschaft mbH Dispositif d'application de matériau fluide ou pâteux sur une bande en mouvement, en particulier de papier ou carton

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4839201A (en) * 1987-12-03 1989-06-13 Valmet Paper Machinery Inc. Method and apparatus for applying coating liquid to a moving base
US5567479A (en) * 1992-12-15 1996-10-22 Valmet Corporation Method and device for coating the face of a roll in a film size press
US5376177A (en) * 1993-08-09 1994-12-27 Macmillan Bloedel Limited Coat weight profiling
EP0761878A2 (fr) * 1995-09-01 1997-03-12 Voith Sulzer Papiermaschinen Gesellschaft mbH Dispositif d'application de matériau fluide ou pâteux sur une bande en mouvement, en particulier de papier ou carton

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1234912A2 (fr) * 2001-02-13 2002-08-28 Mitsubishi Heavy Industries, Ltd. Appareil de couchage et procédé de fabrication de papier couché
EP1234912A3 (fr) * 2001-02-13 2004-01-14 Mitsubishi Heavy Industries, Ltd. Appareil de couchage et procédé de fabrication de papier couché
DE10144600A1 (de) * 2001-09-11 2003-03-27 Voith Paper Patent Gmbh Auftragsvorrichtung
WO2004070113A1 (fr) * 2003-02-10 2004-08-19 Metso Paper, Inc. Dispositif d'application de machine a revetement par transfert de film et procede de revetement correspondant
WO2008151943A1 (fr) * 2007-06-13 2008-12-18 Voith Patent Gmbh Dispositif racleur
CN108049244A (zh) * 2017-12-08 2018-05-18 安徽金亿禾特种纸有限公司 一种涂布均匀的方法
US11267014B2 (en) 2019-03-29 2022-03-08 Airbus Operations Gmbh Device for lacquer transfer
US11331688B2 (en) 2019-03-29 2022-05-17 Airbus Operations Gmbh Device for lacquer transfer
US11369987B2 (en) 2019-03-29 2022-06-28 Airbus Operations Gmbh Device and system
US11504739B2 (en) 2019-03-29 2022-11-22 Airbus Operations Gmbh Device for lacquer transfer
US11413650B2 (en) 2019-04-11 2022-08-16 Airbus Operations Gmbh Lacquer transfer device
US11241708B2 (en) 2019-04-12 2022-02-08 Airbus Operations Gmbh Device for lacquer transfer

Also Published As

Publication number Publication date
FI981135A0 (fi) 1998-05-20
FI981135A (fi) 1999-11-21
AU4268299A (en) 1999-12-06
CA2332249A1 (fr) 1999-11-25
EP1082495A1 (fr) 2001-03-14
FI111230B (fi) 2003-06-30

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